The elements of astronomy : deduced from observations; and demonstrated upon the mathematical principles of the Newtonian philosophy: with Practical Rules whereby the Principal Phenomena are determined. To which is annexed, A Treatise of Projection in general. Designed for Students in Universities. The whole translated from the French of M. De La Caille, Member of the Royal Academy of Sciences at Paris, By John Robertson, F.R.S. With additions and corrections communicated by the author